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• W161128719 abstract "This work investigates the impact of the load representation upon a power system security assessment. This is done according to two important aspects: the adopted direction for the load increment and the dynamic models used to represent its behavior. The first aspect is tackled through an evaluation of contingencies, which is based on the system's load flow model for two load increment directions: the traditional approach, where the system active and reactive load demands are increased proportionally to the base and a second approach that regards the worst case, in which it is adopted the direction that gives the smallest local loading margin for the base case. The second aspect is tackled through a system multi-machine modelling that takes into account the impact of the generators, loads, Automatic Voltage Regulators (AVRs), Over Excitation Limiters (OXLs) and Load Tap Changers (LTCs) dynamic behavior. The dynamic responses of the system are compared to the most critical contingencies previously obtained. Some discrepancies existing in the power system security analysis are analysed for both the increment directions and the dynamic load models through simulations obtained for the IEEE 14 bus system. costs, guaranteeing the competitiveness among companies and saving the already scarce natural resources. These facts make power systems operate with more reduced stability margins. So, it is necessary to know the power systems operation limits in order to guarantee quality and safety margins to power system supplying. Among the limits commonly investigated (such as thermal overload limits and angular instability) voltage instability limit is seen as one of the prominent threats to the safe operation of the electric system (1)-(3). This is the reason why in the last years there have been issued researches (4) on this topic. Moreover, it is known that the dynamic behavior of the load is the key element for a number of incidents related to voltage instability (and collapse) phenomenon observed (3). This work investigates the impact of some aspects related to the load representation for the voltage stability assessment. From the static viewpoint, it is analysed the impact of adopting different directions for the load increment to the contingency screening and ranking process. From the dynamic viewpoint, it is analysed the impact of adopting different dynamic models to represent the load through a multimachine representation." @default.
• W161128719 created "2016-06-24" @default.
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• W161128719 creator A5052958048 @default.
• W161128719 date "2007-01-01" @default.
• W161128719 modified "2023-09-23" @default.
• W161128719 title "A Contribution to the Voltage Stability Studies within Power Systems: Some Aspects Related to the Load Representation" @default.
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